Preheat oven to 425ºF.Brown ground meat in a skillet over medium-high heat. Stir in taco seasoning, tomato sauce, and beans. Set aside.To assemble packets, spray the foil with non-stick spray. Place 1 cup sweet potato cubes in the center of each piece. Top with a small piece of butter alternative or a little drizzle of olive oil(about 1 teaspoon) and a pinch or two of salt. Sprinkle some chopped spinach over the sweet potatoes, followed by about 1/3 cup of taco meat and a sprinkle of Daiya cheese. Fold the sides in, then bring the top and bottom ends of the foil together in the center and fold, sealing the packet.Repeat with remaining ingredients, placing the packets on a rimmed cookie sheet. Bake for 25–30 minutes, until the sweet potatoes are tender.Serve with Vegenaise, salsa, and/or guacamole.Makes 6 servings.